Pulverizing mill



Dec. 22,1925..-

q 1.566,546 f' C. M. LAURITZEN ET'v AL PULVERIZING MILL Filed March 2l 1925 2 .Sheets-Shea) 1 Dec. 22 192.5'.

2 Sheets-Sheet 2 /A Ay PULVERIZING MILL Filed March 2.

lc3. M. LVAURITZ'EN ET AL.

Patented Dec. 22, 192.25. I

UNITED sTArEs CHRISTIAN LAURITZEN, OIF CHICAGO,

PATENT, OFFICE. ,l

AND-WILLIAM H. VOGEL, OFIIIGIILA'ND PARK, ILLINOIS, AssIGNoRs To RAYMOND BROTHERS IMPACT PULVEBIZER co.,

or CHICAGO, ILLINOIsAooRPoRATIoN cF.II.LINoIs. l Y

PUIIVERIZING vIEIIIILIEII.

Application ala march' a, 19:25. seria; No. 12,639'.

lindrical beater` chamber.

One object of this invention is to provide improved means 4for-guiding the material to be pulverized .into the path of the beaters or hammers, and for directingback into the 2O path of these hammers coarse material, or materialcnot ysuiiiciently pulverized,to insure a more evenly proportioned and constant output of the pulverized material, ,and

more economical operation of the'milli- A further Object is to provide improved means for adjusting the fineness of the pul A veriz'ed material producedfsuch means bevA ing accessible for adjustment from outside the mill, without necessarily stopping the operation of the mill. v

justable from outside the beater chamber for Vcompensating for wear of the beaterhammers, whereby, the desired finenessl `of pulverization may be maintained'even after such wear takesplace.

Other objects and advantages of this invent-ion will be apparent from the following detailed description of ertain approved forms of the apparatus.

In the accompanying drawing:

Fig. l'is a central vertical longitudinal section, partly in elevation, through the main portions ofthe null.

substantially on the line 2-2 ofv Fig. 1.

Fig. 3 is a detail longitudinal section corresponding to the lower portion of Fig. 1,

showing a 'modified form of the directing rings. l

Fig. 4 is a view similar to Fig. 1, showing another modification.

A further object is to provide. means ad-- Fig. 2 is a transverse sectionaliview, taken Fig. 5 is a similar View, partly 'broken away, of still another modic'ation.`

Fig. 6 isa transverse'section, correspondil' ingto the right-hand portion ofv Fig. 2,

showing a peri heral inlet opening.

.The mill, as ereshown', referring first to Figs. 1 and 2), is of the well known impact type, and comprises a feeding compartment 1, a beater 'chamber 2 in which the'pulverization process takes place, and a fan chamber 3. A horizontal shaft 4 ,extends` cal chambers 2 and 3, and isrotatably supportedl at its ends, outside of the chambers, in bearings 5 and 6. One projecting end 7 of shaft 4 is connected with Aanelectric Inotor, or other suitable driving means. Within the beater chamberV 2,.:the'v pulverizing Amechanism 8,l hereinafter more specifically described, is xedly'mountedjon rotary shaft 4, and a fan 9 is similarlyfmounted o n shaft 4 -within 'the fan .chambeilf3j.Yl

The material tO be, pulverized is .maincentrally through the substantially vcylindritainedwithin ahopper or'other storagereceptacle, thelower end. of which -is'indicated at 10, and the flow of materialfrem this receptacle into feeding compartment 1 is regulated by theA slide valve 11. Below the 'valve 11, apocketed feed wheel 12 is mounted on a `shaft 13 to rotate vin a clockwise direction, Fig. 1, and thussteadily feeds measured quantities of the material into the lowerportion of feeding compartment 1 and thence through inlet Opening 14 into the inlet end of beater chamber 2. .The shaft 1-3 lis intermitter'ltl'y and adjustably driven at a slow speed, by. a mechanism not shown, from the shaft 15 inthe lower portion of the `mill housing, which -shaft 15' is driven through suitable reduction gearing and the belt 16 from the main rotary shaft 4.

4The pulverizing mechanism 84comprises a plurality (here shown as three duplicate radiall series), of beaters or hammers 17, pivotally mounted at their inner ends 18 for limited swinging movement, within a frame or spider composed of a series of vplates or` discsl9keyed on shaft 4, spaced apart by rings 20, and clamped in assembled position with the rings 20 upon shaft 4 between col` i lar 21 on shaft 4 and an adjustable nut 22 on said Suitable liner members (not 'alli here shown), are arranged aboutv the path of travel of hammers 17 and within the enclosing outer wall ofthe'beater chamber 2', 'and the material is pulverized partially by the impact of the hammers 17, and partly bv being projected by centrifugal force against the liner members.

a constant distribution of the materialv to be pulverized in the path of thejhammers 17 l so that all of thev hammers .will be effective, and consequently ininaintaining a constant output and a constant working lo-ad for the mill. It has been found that some of the material fedinto the beating zone through inlet opening 14, will be thrown out by the outer rows o f hammers and will accumulate i as at 27.

in the lower corners of the beater chamber The hammers 17 will operate'most effeci tively if the clearance betweenrthese ham mers and the surrounding liner-members-is comparatively-small, but with such a small clearance it is particularly di''licult toprovide a constant feed of material to all of the.

hammers and to maintain this material in the narrow beating zone until properly pnlverized. To overcome this diiiiculty we have provided delecting means at the sides of the zone in which the hammers 17. rotateand operate, against which the material thrown out by the side rows of hammers will '1mpact and be directed back horizontally into the path of the hammers and be subjected' to further pulverization.v

Accordingly, we have provided an' inclined directing plate 28, which. preferably is a part of a continuousring or annular member extending clear around one end of the clyindrical chamber 2. The' plate' 28 preferably inclines inwardly toward the hammers, and outwardly from shaft 4 at anI angle of about 45, with one edge extending substantially in linel with the path of travel of the first row'of hammers 17 As shown in Eig. 1, the directing plate or ring 28,' is formed integrally at one end of a liner plate or ring' 29, which extends substantially across the peripheral portion of chamber 2. As the hammers 17 wear away, it is desirable to adjust the plate 28 toward the hammers to compensate for this wear. This-maybe done by means of inserting suitable shims i the 30, as indicated 1, or the plate or ring 28 may be provided with adjusting screws 31 extending through the adjacent wallof millhousing' as indicated in Fig. 5.

At the other side of the hammers 17, within the chamber 2, is positioned a similar inclined delecting ring 32, which is adjustable from outside of the mill housing by means of screws 33. By suitably turning the screws 33, the ring 32 may be moved toward or from the pathcf travel of the' adjacent annular row of hammers -17. The plates 28 and 32 serve to direct.the coarse or unpulverized material thrown thereagainst byA centrifugal force back into the path of travel of the beaters orhammers 17 thereby subjecting the material again to the' pulverizing operation, and-increasing the neness of the product delivered to the fanfchamber 3. The closer the rings 28 and 32 are ad justed to the path of travelof the hammers 17, the longer the materialwill be subjected to the grinding operation, and the finer the grinding.v By properly adjusting thev Vrelative positions of the ringswithf'respect. to path of travel iof the hammers 17 the ineness of the material produced by the mill may be increased or diminished within certain limits. The plates or rings 28yaiid` 32 will also beadjus'ted towardthe hammers-17 to compensate for wear of the hammers, thus maintaining the efficiency of the. mill, even after considerable of `such wear vtakes place.

When these delecting members `are' used as 'hereinabove described, the operation of the mill is steadier, less power is requiredto operate the mill, and a product of more even and constant quality and fineness is delivered from the mill ythrough the conduit 24. lt 'is also possible to operate the mill with a much smaller clearance between the k'outer ends of the hammers 17 and the liner .plates in the chamber 2, thus increasing the efficiency of the mi-ll and the uniformity and 'fineness of the material produced therein.

4'Preferably a recess orI air-pocket 34 will be provided at the top of chamber 2 beyond the beating-zone of hammers 17'. This recess functions to interrupt the conti-nuity of travel of the material through the mill, this retarding action increasing the ei'cieney of the grinding operation. This recess increases the air capacity of the mill and enables the mill to' be operated with a smaller fan, or'the sameV fan will deliver more air through the mill than was formerly the case. The mill -will also be able to carry a heavier load without choking or becoming clogged by an accumulation of stagnant material.

-In the modification shown in Fig. 3, the two deflecting plates'orrings 28' and 32 are secured to,- or made integral with an annular connecting member 35, and this assembly is `adjustable toward one side or the other of chamber. 2 by means of adjust-...

ingA screw 36 and 37 mounted 'in ,the "chamy ber walls and bearing against the opposite i sides of the rings.

*the 'deliecting ring assembly (which: may

ln'the'mod'ication illhstrated .ih Fig; 4,`

I be of lthe form shown in Figzf) is ixedly` mounted within that 'portion 38 of the vmill housing- Which encloses the. chamber- 2, and this casing portion .38 is bodily adjustable laterally to carry' ,thej-j rings" 28.

'and 32 towardfor'-y fi'onr-ther` hammers as desired. f. As showmi-the walls 39 at one end Y` of casing 38 surround 'iandvare slidable along 'a cylinderical 'extension 40 of the iiXed housing 41' at the i'nl'e'etl end' of the mill. The conical outlet portion 42 of casing 38 has a vcylindrical 'extension or neck 43 slidable laterally -Within'an opening 44 in the 'end wall 45 of .th'effan cha-mber').

' Casing section 38 is adjusted laterally, and

held in adjusted position 'byrany suitable means such. as adjusting'screws146 and 47',

' mounted in 'the fixed 4portions o t-the-mil1 shaft 4 in either direction through bearingsl 5 and 6 .by any suitable. thrust means, not here illustrated. I

In the form of the-invention shown in Fig. 5, a regulator or whizzer 48 is mountedA on shaft 4 adjacent the outlet opening 23. This rotary regulator comprises aseriesof radially disposed plates 49, the outer ends of which `are preferably inclined as at 50 and positioned to travel within a short A distance of the inner face of the conical ring i v into the -fan chamber.

51, which forms the inner wall of the outlet 23' at thispoint. The action of this regulator is to reduce very materially the amount of-coarse material passing through outlet 23 This regulator acts as a fanzfor continuing the rotary movement of the contents of beater chamber 2 about the axis of shaft 4, and byl centrifugal. force throws the coarser material against the. diagonally disposed face of ring 5 1 from which it is thrown back into the beating zone in chamber 2. The retarding action of this regulator may be varied by adjusting it along shaft 4 toward or from the conical ring 51. Since this Whizzer 48 performs much the same function as ring 32, previously` described, this ring is omitted in the apparatus .ally through opening 53'directly into the shown in rig. 5 and' only the ring es a the inlet'end. of the chamber-2 is used. This ring 28 and the Whizzer 48" cooperate to' keep the coarse material Withinthebeating' zone until completely pulveriz'ed.y Of course,

Whizzer 48 could be used in the forms 'of the appartus shown in Figs. land 4. In

such casesthei defleeting' ring 32'andwhizer 48 willact to supplementone another` and maintain the material within themill un-4 til complete pulverization is accomplished.

. It isnot essential' that the material bev f ed into the beater chamber 2 at the end he1'e. tofore designated the inlet end fas shown in. Figs. 1, 4 and 5. Tn largerfmills'it might be desirable to feed the material tothe -mill'at some other point, for example at the top or at one side of the peripheral portion of .3

the mill as indicated in Fig. 6. lHere the feed Vcompartment 52, vand the measuring devices therein, may be of the .form .shown the ring A32 could also be used in this form of the apparatus, 'or conversely the'v` in Figli 1, vand the material is fed tangentibeating-zone' of hammers 17. In this form 1 `of the'invention, as in all of'theforms previously described, the coarser material that tends to escape from the action of the ham- ;mers at either side is projected by centrifugal, force against one or thel other of the rings 28 or `32 and thence thrown back into the path of'the hammers. v'Only' the' com- -pletely pulverized Vmaterial 'istoo light vto be so treated, and iioa'ts out through opening 23 upon the'stream of -airdrawn there-V through by fan 9. y

We claim:

1. A pulverizing mill :comprising a substantially cylindrical beaterchamber', a plurality of hammers mounted to revolve withinthe chamber, about the 'axis of the cham-v ber, and annular means mounted within the chamber adjacent the sides of the zone within which the hammers operate, fo'rdirecting material thrown thereagainst, back into the path of the. hammers.

2. A pulverizing -mill comprising a beater chamber, aplurality Aof hammers mounted to move' about an axis in this chamber, the material to be pulverized being fedy into the chamber at one location and the pulverized material withdrawn at another, anddeflecting rings mounted Within the 'chamber adjacent the' zone in which the hammers operate for directing unpulverized material into the path of the hammers.

3. A pulverizing mill comprising a beater chamber,la plurality of hammers mounted to move about an axle in this chamber, the material to be pulverized being` fedinto the chamber at one location and the pulverized material withdrawn at another, and annular meanshaving impact faces inclined to the planes of movementof the hammers mounted within the chamber adjacent-the zone in which the hammers operate for directing the unpulverized material into'the pathof the hammers. Y

4.-'.A pulverizing mill coiriprising a beater chamber, a plurality of hammers mounted to move about an axis in this chamber, the material to be pulverized being fed into the chamber at one location and the pulverized material withdrawn at another, and defiecting rings having impact faces inclined to the planes of movement of theo hammers mounted within the chamber adjacent the zone in which the hammers operatejfor directing unpulverized material into the path of the hammers. i

5. A pulverizing mill comprising abeater chamber, a plurality of hammers mounted to move about an axis in this chamber, the material toA be pulveriz'ed being fed into the chamber at one location and the pulverized material withdrawn at another, and deflecting ring? mounted gvithin the chamber ade zone in which the hammers op- Y erateand adjustable toward and from the' jacent t hammers for directing un'pulverized material into the path of the hammers.

6.--A pulverizing mill comprising a beater chamber, a plurality of hammers mounted Lto movel about an axis in this cl'iamber, the materialto be' pulverized being` fed into the chamber atone location and -the pulverized material withdrawn at another, `means mounted '.within the chamber adjacent the zone'infwhich the hammers operate for directing unpulverized material into, 'the path" jofthehammers, and means for varying the .clearance between the-directing means and the hammers moving adjacent thereto.v '40 7. Apulverizing mill comprising a beater` chamber, a plurality of hammers mounted to move about an axis in vthis chamber, the

- material to be pulverized bein fed into the chamber at one location and t e pulverized material withdrawnat another,` and annular means mounted within the chamber adjacent the sides of the zone in which theihammers operate for delecting material thrown there-v against by centrifugal force, back into the path of the hammers.

8.A pulverizing mill comprising chamber, a plurality of hammers mounted a beater tomove about an axis in this chamber, the

material to be pulveri'zedbeing fed into the chamber at one location and the pulverized material withdrawn at anotherand a'nnular members having vinclined Aimpact faces mounted within the chamber adjacent the'" sides'of the zone in which the hammers operate forV de'lecting material thrown thereagainst by centrifugal force,=back in to the I path .of the hammers. v

9. A' pulverizingmill comprising a beater chamber, a plurality of hammers mounted yto move about an axis in this chamber, the

Y members "of travel "of the hammers.

' 13.` A. pulverizing mill comprising a beatmaterial to be pulverized being fed into the f chamber at one'location and the pulverized material withdrawn at another, annular having inclined mounted within the chamberadjacent the sides" of the r.zone in which the,. hammers operate for deliecting material thrown therex against by centrifugal force, back into the path of the hammers,and means for adjusting the impact members toward or from the hammers.

. 10. A pulverizing rmill comprising a beater chamber, a plurality of hammers mounted Vto move about an axis` in this chamber,

means to feed air and material to be pulverized into'the chamber, and means for withdrawing the air and pulverized material carried thereby, the chamber being provided with a recess or air-'pocket in its peripheral portion beyond the path vof travel of the hammers.

11. A pulverizing mill 'comprisinga beater chamber, a plurality of'hammers mounted to move about :an axis in this chamber, x

mea'ns to feed air and material to be pulverized into the chamber, and means for wither chamber, a plurality of hammers mounted to move about an axis in ,said chamber, the material to be pulverizedj'being fed inv at one end of the chamber and withdrawn at the other end, yand annular deflecting plate, having an impact face inclined toward the path of travel of the hammers, mounted in the inlet end of the beaterchamber.

14. A pulverizingmill comprising a beater chamber,va.plurality of hammers mounted to move'about any axis in .said chamberf the material to be ulverized being fed in at one end of the ciamber and withdrawn at the other end, an annulardelecting plate having an impact surface inclined toward the path offtravel of the hammers,- mounted in the inlet'end of the beater chamber, and means for adjusting the plate t0- ward or from the hammers.

15. ,A pulverizing mill comprising a beater chamber, a plurality of hammers mount-` ed to move about an axis in said chamber, means for feeding in material to be pulverized at .one end of Said chamber, means for withdrawing the pulverized material at the other end of the chamber, and an adjustably 'mounted inclined deflecting member filling yer' chamber, a plurality of hammers mounty atone endy of thechamber and withdrawn.

at the other'end, deflecting plates,r inclined ed to move about an axis in said chamber, the material to be pulverized Abeing fed in downwardly and t'owardthe pat-h of travel of thehammers, mounted" in the respective ends of thebeatergch'amber, and means for adjusting the plates tov'valrdl or from vthe hammers.

17. A pulverizingmill comprising a beated -to move about an axis in said chamber, the material to be pulverized being fed in at one end of the chamber,.means for withdrawing the pulverized material at the other end of the chamber, 'and aninclined deflect-v ing member adjustably mounted in theoutlet end Vof ythe chamber adjacent the path of travel of the hammers.

'18. A pulverizing mill comprising a beater chamber, a plurality of hammers mounted to move about an axis in said chamber,

means'for feedingmaterial to be pulverized into saidchamber, the chamber having yan outlet at one end thereof, means for withdrawing the pulverized material suspended in'air through this outlet, and means adjustable from outside the chamber for regulatl ing the flow of material through this outlet.

19. A pulverizing mill comprising a beater chamber', a plurality of hammers mounted to move about an axis in said chamber, means for feeding material to be pulverized into, said chamber, the chamber having an outlet at one end thereof, means for withdrawing the pulverized material suspended in air through this outlet, and means adjustable from outside the ehambervfor retarding the flow ofl material through this outlet. v

20. A pulverizingmill comprising abeater chamber, a plurality'of hammers mounted to move about an axis in said chamber, means for feeding material to be pulverized into said chamber, thechamber having an outlet at one end thereof, means for withdrawing the pulverized material suspended' vin air through this outlet, and an inclined deflecting means mounted in the outlet end f of the chamber.

. outlet at one end thereof, means forwithdrawing the pulverized material suspended in air through this outlet, and an inclined'. deflectmg means adjustably mounted in theA voutlet end of the chamber.

, `22. A pulverizing mill comprising a beater chamber, a shaft extending therethrough, a

plurality of hammers mounted on said shaft,

intosaid chamber, 'the chamber having` an outlet around the shaft .5 at one end ofthe this outlet, and an adjustable deflecting ring mounted in the outlet vend of the chamber.4

23. A pulverizing mill comprising agbea-ter chamber, a shaft extending centrally. therethrough, a` plurality of hammers, mounted on the shaft, means for feeding material to be ulver`zed t th h b th er chamber, a plurality of hammers, mount-` h p 1 m o e C am er e Chamber aving an outlet around the shaft lat one end of the chamber, a suction means-,for withdrawing the pulverized material suspended in air through this outlet, means adjacent the outlet for retarding the iow of material therethrough and directing this material back toward the hammers, and additional means for feeding-material to be pulverizedv means in the chamber adjacent the path of Y i travel of the hammers for directing unpulverized material into the path ofthe hammers.

` 24:.A A pulverizing mill comprisingv a beater, chamber, a shaft extending centrally therethrough, a plurality of hammers mounted onl the shaft, means for feeding material to be pulverized into the chamber, the chamber having an outlet around the shaft at the other end of the chamber, a suction means for withdrawing the pulverized material suspended in air through this outlet, means adjacent the outlet for retarding the flow of material therethrough and directing this material back toward the hammers, and additionalmeans adjustably mounted in the chamber adjacent the path of travel of the hammers for directing unpulverized material into the path ofthe hammers.

25. A pulverizing mill comprising a beater chamber, ,a shaft extending'l centrally therethrough', a plurality ofv hammers lmounted on the shaft, means for feeding material tobe pulverized. into the chamber, the chamber" having an outlet around the shaft at one end of the chamber, a suction means for withdrawing the pulverized material suspended in air through this outlet, means adjacent the outlet for retarding the flow of material therethrough and directing this material back toward the hammers, and an annular member having an inclined impact face mounted in the chamber adja. cent the path of travel of the hammers.

26. A pulverizing mill comprising a beater chamber, a shaft extending centrally therethrough, a plurality of hammers mounted on the shaft, means for feeding material to be lpulverized into theA chamber, the chamber havingl an outlet around the shaft at one end 'of the chamber, a suction mea-ns for with'-v drawing` the pulveri'zed material sus nded in air through this outlet, means a jacent the outlet for retarding the flow of material therethrough and directing the-material back toward the hammers, and annular members having inclined 'impact faces adjustably mountedin the chamber adjacent each side i of the j the chamber, v means for withdrawing the pulverized material from the chamber, and l Y inclined means in the ends ofthe chamber,

adjacent the path of travel of the hammers for directing material thrown thereagainst byY centrifugal fo'rcebaclr into the path of the'hammers. l

' 28. A pulverizing mill comprising a beater chamber, a plurality of hammers mounted to. move about an-axis in said chamber, means for feeding inmaterial to be pulverized into the chamber, means for withdrawing the pulverized material from the cha mber, and

yinclined means adjustably mounted in the ends of the chamber, adjacent ,the path of travel of the hammers for directing material thrown thereagainst by centrifugal force back into the path of the hammers. 1

CHRISTIANl MQ LAURITZEN. wiLLrAM H. VOGEL. j' 

